Vega provides SIP trunking for legacy TDM PBXs

Application
The customer has a legacy PBX and requires SIP trunks to a SoftSwitch hosted by an ITSP. The Vega can simultaneously register with up to five ITSPs thereby providing Least Cost Routing and resilience between the ITSPs.

PSTN replacement
Upon initial installation the customer may choose to only route outgoing calls to the ITSP’s SoftSwitch, leaving the PSTN provider to route incoming calls. Increasingly though the Vega gateway is installed to replace the PSTN entirely (whilst retaining some lines for resilience), the telephone numbers are ported to the ITSP and consequently all call traffic is now routed to/from the ITSP via the Vega. This typifies VegaStream's message once again; our VoIP gateways provide an ideal stepping-stone approch for customers who wish to migrate to IP telephony at their own pace and without the fear of ripping and replacing their existing telecoms infrastructure overnight.

Installation methods
If installed between the PBX & the PSTN (preferred method) the Vega is privileged to observe all calls which transit its telephony ports & consequently may be configured to route outbound calls to either the ITSP or the PSTN based upon the number being called by the PBX user:

Connection Method 1 - click to enlarge

A further advantage of installing the Vega in this fashion is that the PBX does not require any alteration or programming as it believes it is still directly connected to the PSTN. As a result there is no technical requirement to involve the incumbent maintainer of the PBX. Additionally the Vega can be set to strip any IDA (Indirect Access) digits being prefixed by the PBX before telephone numbers dialled by the users of that PBX to prevent those calls being routed via a particular carrier.

An alternative method of installing the Vega is to attach it to separate trunks or extensions off the PBX. This requires alteration to the PBX’s routing tables as the decision whether to route calls to the PSTN or to the ITSP (via the Vega) remains at the PBX level:

Connection Method 2- click to enlarge

Or this way even:

Connection Method 3 - click to enlarge

Which Vega gateway do I need?
Simply select the appropriate gateway to suit either Analogue, BRI or PRI trunks presently connected to the PBX/PSTN. Also bear in mind the quantity of telephony ports required (ie if the customer presently has 2x BRI connected to the PBX & you are going to install the Vega as per Method 1, you will require a 4 port BRI Vega (2 ports facing the PSTN and 2 ports facing the PBX).

Resilience & Safety
Vega detects failure and re-presents calls:
If the Vega is installed in the preferred manner (between the PBX & PSTN) then when either the PSTN or IP network suffers an outage the Vega can dynamically re-present calls to the other available network without any awareness by the PBX user. Furthermore the Vega will immediately notify the maintainer’s Management System (SNMP supported) of the outage so that this potentially otherwise unseen fault can be rectified.

Added configurability of the Vega permits a “Class of Service” on its call routing decisions; e.g. in the event of an outage the CEO’s calls may be allowed to succeed via this alternative, albeit potentially more expensive route whereas others’ receive a busy/unavailable tone. This selective call re-presentation functionality relies upon the PBX supplying the CLIP of the individual PBX user to the Vega.

Vega assists with power failure:
> Vega 400 – Bypass relays to facilitate direct connectivity from the PBX to the PSTN, or to another Vega 400 standing by

> Vega FXS / FXO gateways - In the event that the customer suffers a power outage relays within the Vega ensure that the first two FXS ports become hard-wire connected to the first two FXO ports which are connected to the PSTN. Consequently these users are able to make and receive calls directly via the PSTN. This is a particularly advantageous Health & Safety benefit for any organisation and therefore consideration should be given to the most appropriate location for the first two FXS ports in the customer’s premises. It should be noted that all Vega FXS gateways feature a minimum of two FXO ports.

Single day Fast Track training
VegaStream offers a not-for-profit single day training course after which delegates will be fluent with installing Vega Gateways for these solutions. Click here to learn more about this course.